Sewing-machine motor.



W. G. SHELTON.

SEWING' MACHINE MGTOR. Armcmon min mw v1. len;-

\ 1,247,732. Patented Nov. 27, 1917.`

kINVENTOR :livin/IESS@ y 50 4shown in outline inthe' drawings, there be UNITED STATES` PATENT Q'OFFICE.

-WILLIAM GENTBY SHELTON, 0F NEW YOBKQN. Y.

SEWING-MACHINE MOTOR.

Specification of Letters Patent.

Patented Nov. 27, 1917.

Application tiled Hay 7, 1917. Serial No. 136,787.

mounted as to be capable of rotating the driving wheel of sewing machines in both directions. A further object of the invention is to provide a small high-speed motor for this purpose. .i

In. the accompanying drawings one practicable embodiment of the invention is illustrated, in which drawings-4 Figure 1 shpws my Vimproved motor in elevation, a plied to the driving wheel of a sewing mac une, the outlineof such driving wheel, sewing-machine arm and table being shown in this View;

Fig. 2 is a view showing the motor in elevation, part of its frame being broken away and its pulley applied to the pulley or driving wheel of a sewing machine, the oint `of application being on the Vside opposite to that represented in Fig. 1,`and

Fig. 3 is an elevational View of the motor and a portion of the pulley or driving wheel at substantially right angles to that of Fig- 1, looking at this from the right-hand side.

Considerable difficulty has been experienced in sewing-machine motors heretofore in use owing to the fact that some sewing machines are driven in one direction of rotation and some in the other at the point of application of the electric driver. This has necessitated the use of reversing switches, or, in some instances, shifting the pulley from one end of the armature shaft to the other. VA motor built according to my improvement is capable of application,y without any change in its workin parts whatsoever, to either sidevof the. riving pulley of the sewing machine for the purpose of effecting drive in opposite directions. Certain of the parts of a sewing machine are ing a. table 5 shown supporting a con-ventional form of head 6 in which is mounted a horizontally disposed shaft 7 carrying a wheel 8. This wheel, as is well known. is

g called by various names, according .to the tion, a driving-wheel. For the purposes of simplicity this wheel 8 will be referred to as a pulley or driving pulley. The motor casing. 9 is shown pivotally mounted upon a standard 10 having a base 11 resting upon, and preferably frictionally e ging, the sewing machine table 5. rllhe pivots 12 are shown connected to the Jmotor casing 9 nearer the pulley end than the other lend of the casing whereby the gravity of the casing has a tendency to hold this in an upright position with the armature shaft 13 in a substantially vertical position. A pulley 14 is shown mounted upon the armature shaft 13." This pulley is made of some suitable material to drivingly engage the pulley 8 of the sewing machine. The wheel 8 in most sewing machines is provided with a rounding contour, and the pulley is shown concaved to securely engage an conform to the shape of the member which it engages. It has heretofore been thought necessary to provide a comparatively large low-speed motor for driving a sewing machine by a .frictional engagement with the pulley 8. The size of the motor basin some respects controlled the point of application of the driving pulley. I have discovered that a small high-Speed motor is very eilicient in this connection and that, owing to the smallness of the motor, it is possible to have this lo cated when in use practically under the pulley 8 or between'such pulley and the sewing machine table 5. By this means the tractive engagement takes place at the side of the pulley 8 and the motor automatically slows down to the requirement of its use. Of course, the employment of a foot-controlled rheostat in connectionwith power motors of various kinds is so well known that specific illustration and description inthe present instance is unnecessary.

The force of engagement between the pulleys 8 and 14 may be provided for by varying the amount of metal in the lower part of the motor casing, as, for instance, by putting` the right amount of metal in the hub 15 at the end of the casing opposite the pulley. A cable 16 leading the current into the motor is also shown entering at the lower end of the casing, which also adds to the tendency of the motor to assume an upright position, In some instances it may be found chine.

desipable to appl n s ring pressure, a convement form of t 1s ing illustrated in the le'af spring 17 secured to the base 11. This j ring is shown disposed between a pair of pms 18 carried by the casing so that in whichever position the motor 1 s placed, the spring will exert yielding and uniform pressure, acoording'to the amount of tilting of the shaft of the motor.

The operation of this sewing machine motor is as follows: Assumin 1that the motion of the sewing machine ings. 1 and 3 of the illustration is in the direction of the arrow 8'l and the motor is built to run with the sun or, as indicated by the arrow 14, from left to right, then the manner of aplplying the motor is to place the left-hand s1 eof the motor pulley 14 against the righthand side of the pulley 8 1n Fig. 1. The weight of the various parts then has a tendency to bring the pulleys into sufficient driving engagement. This weight, as above explained, can, of course, be augmented in various ways. If it is desired to operate the machine with the motor thus applied, it is merely necessary to permit the proper amount of 1 electric current to enter the motor. If the correct direction of rotation of the sewing machine is in the direction of the arrow 8", the manner of applying the motoi` is'merely to swing it on its pivots 12 and press the right-hand side of the pulley 14 against the left-hand side of the pulley 8,- see Fig. 2. This, then, with the driver still running in the same direction, will dcliver the correct rotation to the sewing ma- In either of these applications of the motor it will be seen that the motor is capable of occupying a position substantially beneaththe pulley 8.

Although but one racticable embodiment of the invention is il ustrated, yet itvwill be apparent that various changes may be'made within'the scope of the claims Without departing from the spirit of the invention.

What I claim is 1. A sewing machine motor comprising a support for resting upon and frictionally englaging the table of a sewing machine, an e ectric motor, pivotally mounted, on such support and vmeans acting upon the motor for causing the armature shaft to normally assume a substantially vertical position, and a pulley carried by the armature shaft Gopiel of thisl any be. obtained for for engaging the driving pulley of the sewing machine.

2. A sewing machine motor comprising a support for resting upon and frictionally engaging the table of aI sewing machine, an electric motor, rotatable in one direction, and pivotally mounted, on such support and means acting upon the motor for causing the armature shaft tonormally assume a substantially vertical position, and a pulley carried by the armature shaft for engaging either side of the driving pulley of the sewing machine for efecting rotation in the desired direction. y

3. A sewing machine motor comprising an electric motor, a support to which the motor is pivotally mounted, the pivotal point being above the center of gravity of the electric motor and the parts being so proportioned that the armature shaft normally assumes a vertical position, and a pulley carried by the armature shaft for engaging the driving pulley of a sewing machine.

4. A sewing machine motor comprising an electric motor rotatable in one direction, a support to which the motor is pivotally mounted, the pivotal point being above the center of gravity of the electric motor and the parts being so proportioned that the armature shaft normally assumes a vertical position, and a pulley carried by the armature shaft for engaging either side of the driving pulley of a sewin machine for effecting rotation in the desired direction.

5. In a sewing machine motor, the combination with an electric motor provided with a casing, a support therefor, pivots carried by the motor casing at a point above its center of gravity and mounted in said support, the armature shaft being adapted to` assume a vertical position incident tov gravity, and a pulley mounted upon s aid armature shaft for engaging the driving pulley of a sewing machine.

6. A Isewing machine motor according to claim 5 having means acting on themotor casing for augmenting the action of gravity.

7. In combination with the sewing lmachine motor of claim 5, a spring actlngv on the casing for urging the armature shaft to.

ward a vertical position.

In witness whereof, I have hereunto signed my name.

WILLIAM GENTRY SHELTON.

ve cents each. by addressing the Commissioner of Patents, Washington, n.0." 

